Update DeveloperGuide.md - sort user stories / removed duplicate - add some new user stories - update NFRs (split into sub categories) - include link to product comparison table from Reddit
Update DeveloperGuide.md
- sort user stories / removed duplicate
- add some new user stories
- update NFRs (split into sub categories)
- include link to product comparison table from Reddit

CS2103JAN2017-F12-B1/main,CS2103JAN2017-F12-B1/main